Emerging Technologies in Hazardous Waste Management 8

Tedder, D. W.; Pohland, Frederick G.

doi:10.1007/0-306-46921-9_1

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…Although a more efficient way of discoloration, the use of chlorinated supporting electrodes may lead to the formation of organochlorinated species, possibly more toxics than the initial contaminant. This is the main drawback for the use of this oxidant (Tedder and Pohland, 2000). That is why sodium sulfate was also evaluated.…”

Section: Ocl Rhbmentioning

confidence: 99%

Evaluation of Direct Photolysis, Electrooxidation and Photoelectrooxidation for Rhodamine-B Degradation

Benvenuti

Gabriel

Heberle

et al. 2018

Braz. J. Chem. Eng.

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The focus of this study is to evaluate the efficiency of oxidation processes in the treatment of a solution containing Rhodamine-B (RhB) used in various industrial applications. The advanced oxidation processes of electrooxidation (EO) and photoelectrooxidation (PEO) were used. At the same time, direct photolysis (DP) was also applied. Total organic carbon (TOC) reduction and color removal were evaluated. There was an efficient color removal when DP was performed, and the color removal efficiency was the highest when NaCl was used as supporting electrolyte for PEO and EO. However, the TOC reduction was low, indicating that the degradation of the color does not correspond to the pollutant mineralization.

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Section: Ocl Rhbmentioning

confidence: 99%

Evaluation of Direct Photolysis, Electrooxidation and Photoelectrooxidation for Rhodamine-B Degradation

Benvenuti

Gabriel

Heberle

et al. 2018

Braz. J. Chem. Eng.

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“…where A s is the available metal sulfide surface area, k is the rate constant, and [Aden] and [ • OH] are the respective reactant concentrations. Earlier work (Kwan and Voelker, 2003;Pham et al, 2008;Tedder and Pohland, 2000)…”

Section: Introductionmentioning

confidence: 99%

Non-linear hydroxyl radical formation rate in dispersions containing mixtures of pyrite and chalcopyrite particles

Kaur

Schoonen

2017

Geochimica et Cosmochimica Acta

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The formation of hydroxyl radicals was studied in mixed pyrite-chalcopyrite dispersions in water using the conversion rate of adenine as a proxy for hydroxyl radical formation rate. Experiments were conducted as a function of pH, presence of phosphate buffer, surface loading, and pyrite-to-chalcopyrite ratio. The results indicate that hydroxyl radical formation rate in mixed systems is non-linear with respect to the rates in the pure endmember dispersions. The only exception is a set of experiments in which phosphate buffer is used. In the presence of phosphate buffer, the hydroxyl radical formation is suppressed in mixtures and the rate is close to that predicted based on the reaction kinetics of the pure endmembers. The non-linear hydroxyl radical formation in dispersions containing mixtures of pyrite and chalcopyrite is likely the result of two complementary processes. One is the fact that pyrite and chalcopyrite form a galvanic couple. In this arrangement, chalcopyrite oxidation is accelerated, while pyrite passes electrons withdrawn from chalcopyrite to molecular oxygen, the oxidant. The incomplete reduction of molecular oxygen leads to the formation of hydrogen peroxide and hydroxyl radical. The galvanic coupling appears to be augmented by the fact that chalcopyrite generates a significant amount of hydrogen peroxide upon dispersal in water. This

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Emerging Technologies in Hazardous Waste Management 8

Cited by 2 publications

References 27 publications

Evaluation of Direct Photolysis, Electrooxidation and Photoelectrooxidation for Rhodamine-B Degradation

Evaluation of Direct Photolysis, Electrooxidation and Photoelectrooxidation for Rhodamine-B Degradation

Non-linear hydroxyl radical formation rate in dispersions containing mixtures of pyrite and chalcopyrite particles

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